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B.S.T.J. Briefs: A Finline Radiator

01 September 1973

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Tapered finline might constitute a radiating element compatible with planar technology and therefore be suitable for antenna arrays fed by integrated circuitry. We have constructed such an element, not by photoetching a substrate but by mounting a tapered fin in a circular waveguide such that it is fed in Robertson's traditional way,1 and then applying a dielectric "substrate" to the fin. Measurements of radiation patterns at 18.5 GHz are given for the prototype element using various "substrate" thicknesses. It is found that the element has considerable gain, and that performance improves with the thickness of the simulated substrate.